/*
    Copyright 1996-2008 Ariba, Inc.

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.

    $Id: //ariba/platform/util/core/ariba/util/core/Crypt.java#6 $
*/

package ariba.util.core;

import java.io.PrintWriter;
import java.util.Random;

/**
    Crypt

    @aribaapi ariba
*/
public class Crypt
{
    private static final int Iterations = 16;

    private static final int ConSalt[] =
    {
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
        0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
        0x0A, 0x0B, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A,
        0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12,
        0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A,
        0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22,
        0x23, 0x24, 0x25, 0x20, 0x21, 0x22, 0x23, 0x24,
        0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C,
        0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34,
        0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C,
        0x3D, 0x3E, 0x3F, 0x00, 0x00, 0x00, 0x00, 0x00,
    };

    private static final boolean shifts2[] =
    {
        false, false, true, true, true, true, true, true,
        false, true,  true, true, true, true, true, false
    };

    private static final int skb[][] =
    {
        {
                //for C bits (numbered as per FIPS 46) 1 2 3 4 5 6
            0x00000000, 0x00000010, 0x20000000, 0x20000010,
            0x00010000, 0x00010010, 0x20010000, 0x20010010,
            0x00000800, 0x00000810, 0x20000800, 0x20000810,
            0x00010800, 0x00010810, 0x20010800, 0x20010810,
            0x00000020, 0x00000030, 0x20000020, 0x20000030, 
            0x00010020, 0x00010030, 0x20010020, 0x20010030,
            0x00000820, 0x00000830, 0x20000820, 0x20000830,
            0x00010820, 0x00010830, 0x20010820, 0x20010830,
            0x00080000, 0x00080010, 0x20080000, 0x20080010,
            0x00090000, 0x00090010, 0x20090000, 0x20090010,
            0x00080800, 0x00080810, 0x20080800, 0x20080810,
            0x00090800, 0x00090810, 0x20090800, 0x20090810,
            0x00080020, 0x00080030, 0x20080020, 0x20080030,
            0x00090020, 0x00090030, 0x20090020, 0x20090030,
            0x00080820, 0x00080830, 0x20080820, 0x20080830,
            0x00090820, 0x00090830, 0x20090820, 0x20090830,
        },
        {
                //for C bits (numbered as per FIPS 46) 7 8 10 11 12 13
            0x00000000, 0x02000000, 0x00002000, 0x02002000,
            0x00200000, 0x02200000, 0x00202000, 0x02202000, 
            0x00000004, 0x02000004, 0x00002004, 0x02002004,
            0x00200004, 0x02200004, 0x00202004, 0x02202004,
            0x00000400, 0x02000400, 0x00002400, 0x02002400,
            0x00200400, 0x02200400, 0x00202400, 0x02202400,
            0x00000404, 0x02000404, 0x00002404, 0x02002404,
            0x00200404, 0x02200404, 0x00202404, 0x02202404,
            0x10000000, 0x12000000, 0x10002000, 0x12002000,
            0x10200000, 0x12200000, 0x10202000, 0x12202000,
            0x10000004, 0x12000004, 0x10002004, 0x12002004,
            0x10200004, 0x12200004, 0x10202004, 0x12202004,
            0x10000400, 0x12000400, 0x10002400, 0x12002400,
            0x10200400, 0x12200400, 0x10202400, 0x12202400,
            0x10000404, 0x12000404, 0x10002404, 0x12002404,
            0x10200404, 0x12200404, 0x10202404, 0x12202404,
        },
        {
                //for C bits (numbered as per FIPS 46) 14 15 16 17 19 20
            0x00000000, 0x00000001, 0x00040000, 0x00040001,
            0x01000000, 0x01000001, 0x01040000, 0x01040001,
            0x00000002, 0x00000003, 0x00040002, 0x00040003,
            0x01000002, 0x01000003, 0x01040002, 0x01040003,
            0x00000200, 0x00000201, 0x00040200, 0x00040201,
            0x01000200, 0x01000201, 0x01040200, 0x01040201,
            0x00000202, 0x00000203, 0x00040202, 0x00040203,
            0x01000202, 0x01000203, 0x01040202, 0x01040203,
            0x08000000, 0x08000001, 0x08040000, 0x08040001,
            0x09000000, 0x09000001, 0x09040000, 0x09040001,
            0x08000002, 0x08000003, 0x08040002, 0x08040003,
            0x09000002, 0x09000003, 0x09040002, 0x09040003,
            0x08000200, 0x08000201, 0x08040200, 0x08040201,
            0x09000200, 0x09000201, 0x09040200, 0x09040201,
            0x08000202, 0x08000203, 0x08040202, 0x08040203,
            0x09000202, 0x09000203, 0x09040202, 0x09040203,
        },
        {
                //for C bits (numbered as per FIPS 46) 21 23 24 26 27 28
            0x00000000, 0x00100000, 0x00000100, 0x00100100,
            0x00000008, 0x00100008, 0x00000108, 0x00100108,
            0x00001000, 0x00101000, 0x00001100, 0x00101100,
            0x00001008, 0x00101008, 0x00001108, 0x00101108,
            0x04000000, 0x04100000, 0x04000100, 0x04100100,
            0x04000008, 0x04100008, 0x04000108, 0x04100108,
            0x04001000, 0x04101000, 0x04001100, 0x04101100,
            0x04001008, 0x04101008, 0x04001108, 0x04101108,
            0x00020000, 0x00120000, 0x00020100, 0x00120100,
            0x00020008, 0x00120008, 0x00020108, 0x00120108,
            0x00021000, 0x00121000, 0x00021100, 0x00121100,
            0x00021008, 0x00121008, 0x00021108, 0x00121108,
            0x04020000, 0x04120000, 0x04020100, 0x04120100,
            0x04020008, 0x04120008, 0x04020108, 0x04120108,
            0x04021000, 0x04121000, 0x04021100, 0x04121100,
            0x04021008, 0x04121008, 0x04021108, 0x04121108,
        },
        {
                //for D bits (numbered as per FIPS 46) 1 2 3 4 5 6
            0x00000000, 0x10000000, 0x00010000, 0x10010000,
            0x00000004, 0x10000004, 0x00010004, 0x10010004,
            0x20000000, 0x30000000, 0x20010000, 0x30010000,
            0x20000004, 0x30000004, 0x20010004, 0x30010004,
            0x00100000, 0x10100000, 0x00110000, 0x10110000,
            0x00100004, 0x10100004, 0x00110004, 0x10110004,
            0x20100000, 0x30100000, 0x20110000, 0x30110000,
            0x20100004, 0x30100004, 0x20110004, 0x30110004,
            0x00001000, 0x10001000, 0x00011000, 0x10011000,
            0x00001004, 0x10001004, 0x00011004, 0x10011004,
            0x20001000, 0x30001000, 0x20011000, 0x30011000,
            0x20001004, 0x30001004, 0x20011004, 0x30011004,
            0x00101000, 0x10101000, 0x00111000, 0x10111000,
            0x00101004, 0x10101004, 0x00111004, 0x10111004,
            0x20101000, 0x30101000, 0x20111000, 0x30111000,
            0x20101004, 0x30101004, 0x20111004, 0x30111004,
        },
        {
                //for D bits (numbered as per FIPS 46) 8 9 11 12 13 14
            0x00000000, 0x08000000, 0x00000008, 0x08000008,
            0x00000400, 0x08000400, 0x00000408, 0x08000408,
            0x00020000, 0x08020000, 0x00020008, 0x08020008,
            0x00020400, 0x08020400, 0x00020408, 0x08020408,
            0x00000001, 0x08000001, 0x00000009, 0x08000009,
            0x00000401, 0x08000401, 0x00000409, 0x08000409,
            0x00020001, 0x08020001, 0x00020009, 0x08020009,
            0x00020401, 0x08020401, 0x00020409, 0x08020409,
            0x02000000, 0x0A000000, 0x02000008, 0x0A000008,
            0x02000400, 0x0A000400, 0x02000408, 0x0A000408,
            0x02020000, 0x0A020000, 0x02020008, 0x0A020008,
            0x02020400, 0x0A020400, 0x02020408, 0x0A020408,
            0x02000001, 0x0A000001, 0x02000009, 0x0A000009,
            0x02000401, 0x0A000401, 0x02000409, 0x0A000409,
            0x02020001, 0x0A020001, 0x02020009, 0x0A020009,
            0x02020401, 0x0A020401, 0x02020409, 0x0A020409,
        },
        {
                //for D bits (numbered as per FIPS 46) 16 17 18 19 20 21
            0x00000000, 0x00000100, 0x00080000, 0x00080100,
            0x01000000, 0x01000100, 0x01080000, 0x01080100,
            0x00000010, 0x00000110, 0x00080010, 0x00080110,
            0x01000010, 0x01000110, 0x01080010, 0x01080110,
            0x00200000, 0x00200100, 0x00280000, 0x00280100,
            0x01200000, 0x01200100, 0x01280000, 0x01280100,
            0x00200010, 0x00200110, 0x00280010, 0x00280110,
            0x01200010, 0x01200110, 0x01280010, 0x01280110,
            0x00000200, 0x00000300, 0x00080200, 0x00080300,
            0x01000200, 0x01000300, 0x01080200, 0x01080300,
            0x00000210, 0x00000310, 0x00080210, 0x00080310,
            0x01000210, 0x01000310, 0x01080210, 0x01080310,
            0x00200200, 0x00200300, 0x00280200, 0x00280300,
            0x01200200, 0x01200300, 0x01280200, 0x01280300,
            0x00200210, 0x00200310, 0x00280210, 0x00280310,
            0x01200210, 0x01200310, 0x01280210, 0x01280310,
        },
        {
                //for D bits (numbered as per FIPS 46) 22 23 24 25 27 28
            0x00000000, 0x04000000, 0x00040000, 0x04040000,
            0x00000002, 0x04000002, 0x00040002, 0x04040002,
            0x00002000, 0x04002000, 0x00042000, 0x04042000,
            0x00002002, 0x04002002, 0x00042002, 0x04042002,
            0x00000020, 0x04000020, 0x00040020, 0x04040020,
            0x00000022, 0x04000022, 0x00040022, 0x04040022,
            0x00002020, 0x04002020, 0x00042020, 0x04042020,
            0x00002022, 0x04002022, 0x00042022, 0x04042022,
            0x00000800, 0x04000800, 0x00040800, 0x04040800,
            0x00000802, 0x04000802, 0x00040802, 0x04040802,
            0x00002800, 0x04002800, 0x00042800, 0x04042800,
            0x00002802, 0x04002802, 0x00042802, 0x04042802,
            0x00000820, 0x04000820, 0x00040820, 0x04040820,
            0x00000822, 0x04000822, 0x00040822, 0x04040822,
            0x00002820, 0x04002820, 0x00042820, 0x04042820,
            0x00002822, 0x04002822, 0x00042822, 0x04042822,
        },
    };

    private static final int SPtrans[][] =
    {
        {
            /* nibble 0 */
            0x00820200, 0x00020000, 0x80800000, 0x80820200,
            0x00800000, 0x80020200, 0x80020000, 0x80800000,
            0x80020200, 0x00820200, 0x00820000, 0x80000200,
            0x80800200, 0x00800000, 0x00000000, 0x80020000,
            0x00020000, 0x80000000, 0x00800200, 0x00020200,
            0x80820200, 0x00820000, 0x80000200, 0x00800200,
            0x80000000, 0x00000200, 0x00020200, 0x80820000,
            0x00000200, 0x80800200, 0x80820000, 0x00000000,
            0x00000000, 0x80820200, 0x00800200, 0x80020000,
            0x00820200, 0x00020000, 0x80000200, 0x00800200,
            0x80820000, 0x00000200, 0x00020200, 0x80800000,
            0x80020200, 0x80000000, 0x80800000, 0x00820000,
            0x80820200, 0x00020200, 0x00820000, 0x80800200,
            0x00800000, 0x80000200, 0x80020000, 0x00000000,
            0x00020000, 0x00800000, 0x80800200, 0x00820200,
            0x80000000, 0x80820000, 0x00000200, 0x80020200,
        },
        {
            /* nibble 1 */
            0x10042004, 0x00000000, 0x00042000, 0x10040000,
            0x10000004, 0x00002004, 0x10002000, 0x00042000,
            0x00002000, 0x10040004, 0x00000004, 0x10002000,
            0x00040004, 0x10042000, 0x10040000, 0x00000004,
            0x00040000, 0x10002004, 0x10040004, 0x00002000,
            0x00042004, 0x10000000, 0x00000000, 0x00040004,
            0x10002004, 0x00042004, 0x10042000, 0x10000004,
            0x10000000, 0x00040000, 0x00002004, 0x10042004,
            0x00040004, 0x10042000, 0x10002000, 0x00042004,
            0x10042004, 0x00040004, 0x10000004, 0x00000000,
            0x10000000, 0x00002004, 0x00040000, 0x10040004,
            0x00002000, 0x10000000, 0x00042004, 0x10002004,
            0x10042000, 0x00002000, 0x00000000, 0x10000004,
            0x00000004, 0x10042004, 0x00042000, 0x10040000,
            0x10040004, 0x00040000, 0x00002004, 0x10002000,
            0x10002004, 0x00000004, 0x10040000, 0x00042000,
        },
        {
            /* nibble 2 */
            0x41000000, 0x01010040, 0x00000040, 0x41000040,
            0x40010000, 0x01000000, 0x41000040, 0x00010040,
            0x01000040, 0x00010000, 0x01010000, 0x40000000,
            0x41010040, 0x40000040, 0x40000000, 0x41010000,
            0x00000000, 0x40010000, 0x01010040, 0x00000040,
            0x40000040, 0x41010040, 0x00010000, 0x41000000,
            0x41010000, 0x01000040, 0x40010040, 0x01010000,
            0x00010040, 0x00000000, 0x01000000, 0x40010040,
            0x01010040, 0x00000040, 0x40000000, 0x00010000,
            0x40000040, 0x40010000, 0x01010000, 0x41000040,
            0x00000000, 0x01010040, 0x00010040, 0x41010000,
            0x40010000, 0x01000000, 0x41010040, 0x40000000,
            0x40010040, 0x41000000, 0x01000000, 0x41010040,
            0x00010000, 0x01000040, 0x41000040, 0x00010040,
            0x01000040, 0x00000000, 0x41010000, 0x40000040,
            0x41000000, 0x40010040, 0x00000040, 0x01010000,
        },
        {
            /* nibble 3 */
            0x00100402, 0x04000400, 0x00000002, 0x04100402,
            0x00000000, 0x04100000, 0x04000402, 0x00100002,
            0x04100400, 0x04000002, 0x04000000, 0x00000402,
            0x04000002, 0x00100402, 0x00100000, 0x04000000,
            0x04100002, 0x00100400, 0x00000400, 0x00000002,
            0x00100400, 0x04000402, 0x04100000, 0x00000400,
            0x00000402, 0x00000000, 0x00100002, 0x04100400,
            0x04000400, 0x04100002, 0x04100402, 0x00100000,
            0x04100002, 0x00000402, 0x00100000, 0x04000002,
            0x00100400, 0x04000400, 0x00000002, 0x04100000,
            0x04000402, 0x00000000, 0x00000400, 0x00100002,
            0x00000000, 0x04100002, 0x04100400, 0x00000400,
            0x04000000, 0x04100402, 0x00100402, 0x00100000,
            0x04100402, 0x00000002, 0x04000400, 0x00100402,
            0x00100002, 0x00100400, 0x04100000, 0x04000402,
            0x00000402, 0x04000000, 0x04000002, 0x04100400,
        },
        {
            /* nibble 4 */
            0x02000000, 0x00004000, 0x00000100, 0x02004108,
            0x02004008, 0x02000100, 0x00004108, 0x02004000,
            0x00004000, 0x00000008, 0x02000008, 0x00004100,
            0x02000108, 0x02004008, 0x02004100, 0x00000000,
            0x00004100, 0x02000000, 0x00004008, 0x00000108,
            0x02000100, 0x00004108, 0x00000000, 0x02000008,
            0x00000008, 0x02000108, 0x02004108, 0x00004008,
            0x02004000, 0x00000100, 0x00000108, 0x02004100,
            0x02004100, 0x02000108, 0x00004008, 0x02004000,
            0x00004000, 0x00000008, 0x02000008, 0x02000100,
            0x02000000, 0x00004100, 0x02004108, 0x00000000,
            0x00004108, 0x02000000, 0x00000100, 0x00004008,
            0x02000108, 0x00000100, 0x00000000, 0x02004108,
            0x02004008, 0x02004100, 0x00000108, 0x00004000,
            0x00004100, 0x02004008, 0x02000100, 0x00000108,
            0x00000008, 0x00004108, 0x02004000, 0x02000008,
        },
        {
            /* nibble 5 */
            0x20000010, 0x00080010, 0x00000000, 0x20080800,
            0x00080010, 0x00000800, 0x20000810, 0x00080000,
            0x00000810, 0x20080810, 0x00080800, 0x20000000,
            0x20000800, 0x20000010, 0x20080000, 0x00080810,
            0x00080000, 0x20000810, 0x20080010, 0x00000000,
            0x00000800, 0x00000010, 0x20080800, 0x20080010,
            0x20080810, 0x20080000, 0x20000000, 0x00000810,
            0x00000010, 0x00080800, 0x00080810, 0x20000800,
            0x00000810, 0x20000000, 0x20000800, 0x00080810,
            0x20080800, 0x00080010, 0x00000000, 0x20000800,
            0x20000000, 0x00000800, 0x20080010, 0x00080000,
            0x00080010, 0x20080810, 0x00080800, 0x00000010,
            0x20080810, 0x00080800, 0x00080000, 0x20000810,
            0x20000010, 0x20080000, 0x00080810, 0x00000000,
            0x00000800, 0x20000010, 0x20000810, 0x20080800,
            0x20080000, 0x00000810, 0x00000010, 0x20080010,
        },
        {
            /* nibble 6 */
            0x00001000, 0x00000080, 0x00400080, 0x00400001,
            0x00401081, 0x00001001, 0x00001080, 0x00000000,
            0x00400000, 0x00400081, 0x00000081, 0x00401000,
            0x00000001, 0x00401080, 0x00401000, 0x00000081,
            0x00400081, 0x00001000, 0x00001001, 0x00401081,
            0x00000000, 0x00400080, 0x00400001, 0x00001080,
            0x00401001, 0x00001081, 0x00401080, 0x00000001,
            0x00001081, 0x00401001, 0x00000080, 0x00400000,
            0x00001081, 0x00401000, 0x00401001, 0x00000081,
            0x00001000, 0x00000080, 0x00400000, 0x00401001,
            0x00400081, 0x00001081, 0x00001080, 0x00000000,
            0x00000080, 0x00400001, 0x00000001, 0x00400080,
            0x00000000, 0x00400081, 0x00400080, 0x00001080,
            0x00000081, 0x00001000, 0x00401081, 0x00400000,
            0x00401080, 0x00000001, 0x00001001, 0x00401081,
            0x00400001, 0x00401080, 0x00401000, 0x00001001,
        },
        {
            /* nibble 7 */
            0x08200020, 0x08208000, 0x00008020, 0x00000000,
            0x08008000, 0x00200020, 0x08200000, 0x08208020,
            0x00000020, 0x08000000, 0x00208000, 0x00008020,
            0x00208020, 0x08008020, 0x08000020, 0x08200000,
            0x00008000, 0x00208020, 0x00200020, 0x08008000,
            0x08208020, 0x08000020, 0x00000000, 0x00208000,
            0x08000000, 0x00200000, 0x08008020, 0x08200020,
            0x00200000, 0x00008000, 0x08208000, 0x00000020,
            0x00200000, 0x00008000, 0x08000020, 0x08208020,
            0x00008020, 0x08000000, 0x00000000, 0x00208000,
            0x08200020, 0x08008020, 0x08008000, 0x00200020,
            0x08208000, 0x00000020, 0x00200020, 0x08008000,
            0x08208020, 0x00200000, 0x08200000, 0x08000020,
            0x00208000, 0x00008020, 0x08008020, 0x08200000,
            0x00000020, 0x08208000, 0x00208020, 0x00000000,
            0x08000000, 0x08200020, 0x00008000, 0x00208020
        }
    };

    private static final int cov_2char[] =
    {
        0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
        0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44,
        0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C,
        0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54,
        0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62,
        0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A,
        0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72,
        0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
    };

    private static final int byteToUnsigned (byte b)
    {
        int value = (int)b;

        return(value >= 0 ? value : value + 256);
    }

    private static int fourBytesToInt (byte b[], int offset)
    {
        int value;

        value  =  byteToUnsigned(b[offset++]);
        value |= (byteToUnsigned(b[offset++]) <<  8);
        value |= (byteToUnsigned(b[offset++]) << 16);
        value |= (byteToUnsigned(b[offset++]) << 24);

        return(value);
    }

    private static final void intToFourBytes (int iValue, byte b[], int offset)
    {
        b[offset++] = (byte)((iValue)        & 0xff);
        b[offset++] = (byte)((iValue >>>  8) & 0xff);
        b[offset++] = (byte)((iValue >>> 16) & 0xff);
        b[offset++] = (byte)((iValue >>> 24) & 0xff);
    }

    private static final void PERM_OP (int a, int b, int n, int m, int results[])
    {
        int t;

        t = ((a >>> n) ^ b) & m;
        a ^= t << n;
        b ^= t;

        results[0] = a;
        results[1] = b;
    }

    private static final int HPERM_OP (int a, int n, int m)
    {
        int t;

        t = ((a << (16 - n)) ^ a) & m;
        a = a ^ t ^ (t >>> (16 - n));

        return(a);
    }

    private static int [] DESSetKey (byte key[])
    {
        int schedule[] = new int[Iterations * 2];

        int c = fourBytesToInt(key, 0);
        int d = fourBytesToInt(key, 4);

        int results[] = new int[2];

        PERM_OP(d, c, 4, 0x0f0f0f0f, results);
        d = results[0]; c = results[1];

        c = HPERM_OP(c, -2, 0xcccc0000);
        d = HPERM_OP(d, -2, 0xcccc0000);

        PERM_OP(d, c, 1, 0x55555555, results);
        d = results[0]; c = results[1];

        PERM_OP(c, d, 8, 0x00ff00ff, results);
        c = results[0]; d = results[1];

        PERM_OP(d, c, 1, 0x55555555, results);
        d = results[0]; c = results[1];

        d = (((d & 0x000000ff) <<  16) |  (d & 0x0000ff00)     |
             ((d & 0x00ff0000) >>> 16) | ((c & 0xf0000000) >>> 4));
        c &= 0x0fffffff;

        int s, t;
        int j = 0;

        for (int i = 0; i < Iterations; i ++) {
            if (shifts2[i]) {
                c = (c >>> 2) | (c << 26);
                d = (d >>> 2) | (d << 26);
            }
            else {
                c = (c >>> 1) | (c << 27);
                d = (d >>> 1) | (d << 27);
            }

            c &= 0x0fffffff;
            d &= 0x0fffffff;

            s = skb[0][ (c       ) & 0x3f                       ]|
                skb[1][((c >>>  6) & 0x03) | ((c >>>  7) & 0x3c)]|
                skb[2][((c >>> 13) & 0x0f) | ((c >>> 14) & 0x30)]|
                skb[3][((c >>> 20) & 0x01) | ((c >>> 21) & 0x06) |
                                           ((c >>> 22) & 0x38)];

            t = skb[4][ (d     )  & 0x3f                       ]|
                skb[5][((d >>> 7) & 0x03) | ((d >>>  8) & 0x3c)]|
                skb[6][ (d >>>15) & 0x3f                       ]|
                skb[7][((d >>>21) & 0x0f) | ((d >>> 22) & 0x30)];

            schedule[j++] = ((t <<  16) | (s & 0x0000ffff)) & 0xffffffff;
            s             = ((s >>> 16) | (t & 0xffff0000));

            s             = (s << 4) | (s >>> 28);
            schedule[j++] = s & 0xffffffff;
        }
        return(schedule);
    }

    private static final int D_ENCRYPT (
        int L, int R, int S, int E0, int E1, int s[])
    {
        int t, u, v;

        v = R ^ (R >>> 16);
        u = v & E0;
        v = v & E1;
        u = (u ^ (u << 16)) ^ R ^ s[S];
        t = (v ^ (v << 16)) ^ R ^ s[S + 1];
        t = (t >>> 4) | (t << 28);

        L ^= (SPtrans[1][(t       ) & 0x3f] |
              SPtrans[3][(t >>>  8) & 0x3f] |
              SPtrans[5][(t >>> 16) & 0x3f] |
              SPtrans[7][(t >>> 24) & 0x3f] |
              SPtrans[0][(u       ) & 0x3f] |
              SPtrans[2][(u >>>  8) & 0x3f] |
              SPtrans[4][(u >>> 16) & 0x3f] |
              SPtrans[6][(u >>> 24) & 0x3f]);

        return(L);
    }

    private static final int [] body (int schedule[], int Eswap0, int Eswap1)
    {
        int left = 0;
        int right = 0;
        int t     = 0;

        for (int j = 0; j < 25; j ++) {
            for (int i = 0; i < Iterations * 2; i += 4) {
                left  = D_ENCRYPT(left,  right, i,     Eswap0, Eswap1, schedule);
                right = D_ENCRYPT(right, left,  i + 2, Eswap0, Eswap1, schedule);
            }
            t     = left;
            left  = right;
            right = t;
        }

        t = right;

        right = (left >>> 1) | (left << 31);
        left  = (t    >>> 1) | (t    << 31);

        left  &= 0xffffffff;
        right &= 0xffffffff;

        int results[] = new int[2];

        PERM_OP(right, left, 1, 0x55555555, results);
        right = results[0]; left = results[1];

        PERM_OP(left, right, 8, 0x00ff00ff, results);
        left = results[0]; right = results[1];

        PERM_OP(right, left, 2, 0x33333333, results);
        right = results[0]; left = results[1];

        PERM_OP(left, right, 16, 0x0000ffff, results);
        left = results[0]; right = results[1];

        PERM_OP(right, left, 4, 0x0f0f0f0f, results);
        right = results[0]; left = results[1];

        int out[] = new int[2];

        out[0] = left; out[1] = right;

        return(out);
    }

    /**
        Performs a one-way encryption using this class's algorithm.
        @param salt the salt to use. The salt must be a String of 2 
        chars, and in the range "[a-z][A-Z][0-9]./".
        @param original the string to be encrypted.
        @return the encrypted String, or null if the salt is invalid.
        @aribaapi ariba
    */
    public static final String crypt (String salt, String original)
    {
        if (!isSaltValid(salt)) {
            return null;
        }
        FastStringBuffer buffer = new FastStringBuffer("             ");
        char charZero = salt.charAt(0);
        char charOne  = salt.charAt(1);

        buffer.setCharAt(0, charZero);
        buffer.setCharAt(1, charOne);

        int Eswap0 = ConSalt[(int)charZero];
        int Eswap1 = ConSalt[(int)charOne] << 4;

        byte key[] = new byte[8];

        for (int i = 0; i < key.length; i ++) {
            key[i] = (byte)0;
        }

        for (int i = 0; i < key.length && i < original.length(); i ++) {
            int iChar = (int)original.charAt(i);

            key[i] = (byte)(iChar << 1);
        }

        int schedule[] = DESSetKey(key);
        int out[]      = body(schedule, Eswap0, Eswap1);

        byte b[] = new byte[9];

        intToFourBytes(out[0], b, 0);
        intToFourBytes(out[1], b, 4);
        b[8] = 0;

        for (int i = 2, y = 0, u = 0x80; i < 13; i ++) {
            for (int j = 0, c = 0; j < 6; j ++) {
                c <<= 1;

                if (((int)b[y] & u) != 0) {
                    c |= 1;
                }

                u >>>= 1;

                if (u == 0) {
                    y++;
                    u = 0x80;
                }
                buffer.setCharAt(i, (char)cov_2char[c]);
            }
        }
        return(buffer.toString());
    }

    public static void main (String args[])
    {
        PrintWriter out = SystemUtil.out();
        PrintWriter err = SystemUtil.err();

        if (args.length == 1) {
            String salt = StringUtil.strcat(String.valueOf(randomChar()),
                                      String.valueOf(randomChar()));
            Fmt.F(out, "%s\n", crypt(salt, args[0]));
            SystemUtil.exit(0);
        }
        else if (args.length == 2) {
            String encrypted = crypt(args[0], args[1]);
            if (encrypted == null) {
                Fmt.F(err, "Invalid salt argument");
                usage(err);
            }
            Fmt.F(out, "%s\n", encrypted);
            SystemUtil.exit(0);
        }
        else {
            usage(err);
        }

    }

    public static void usage (PrintWriter err)
    {
        Fmt.F(err, "Usage: aribacrypt [ salt ] password\n");
        Fmt.F(err, "\tIf salt is provided, it must be a string " +
              "of 2 characters in the set \"[a-z][A-Z][0-9]./\".");
        SystemUtil.exit(1);
    }

    private static final Random rand = new Random();
    private static final String alphabet =
        "01234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

    private static char randomChar ()
    {
        int index = rand.nextInt() % alphabet.length();
        if (index < 0) {
            index = -index;
        }
        return alphabet.charAt(index);
    }

    private static boolean isSaltValid (String salt)
    {
        if (salt == null || salt.length() != 2) {
            return false;
        }
        for (int i=0; i<2; i++) {
            char ch = salt.charAt(i);
            boolean isValid =
                (ch >= '0' && ch <= '9') ||
                (ch >= 'a' && ch <= 'z') ||
                (ch >= 'A' && ch <= 'Z') ||
                (ch == '.') ||
                (ch == '/');
            if (!isValid) {
                return false;
            }
        }
        return true;
    }
}
